On purpose i am not reading the reviews, but a friend of me told me about IGN's verdict and....damn.
Though the straightforward and fetch-quest-heavy main story overstays its welcome, the option of joyfully adventuring through a rich, expansive open world was always there for me when I’d start to burn out. Even if the plot isn’t terribly interesting, the many characters who play a part in it are, and along with the excellent combat and RPG gameplay, they elevate The Witcher 3 to a plane few other RPGs inhabit.
That's somewhat of a bummer. Especially when CDPR spoke about fetch quests in interviews before and how they don't like them.